Filter coefficients - changing sampling rate

I want to implement a particular filter on usrp. It has 240-taps and a
sampling rate of 125kHz.

I want to change the sampling rate of the filter from 125kHz to 250kHz
to match the minimum sampling rate of usrp (using decimation=256 /

if i run the filter as is, the spectrum of the filter is compacted. How
do i modify the filter taps to change the filter’s sampling rate?